landscape cutting with cardboard

Trying out how a sliced landscape looks with different materials. Used 3mm single fluted cardboard. This should be cut perpendicular to wave direction in cardboard to avoid strange artifacts. It feels like a puzzle, maybe it could be used as such in a class geography. Next will be visualisation of the subsoil, which has a lot of variety (clay, sand loam) in this area (glacial artefacts)

Source files: AHN (algemene hoogtekaart nederland, digital information of the Dutch topography). Downloaded the information (geotiff) from AHN site, converted with QGIS to 16 bit bitmap (black and white scale), combined them in photoshop and converted this to a smaller bitmap (GIF, about 1000 x 2000 pixel) to make a 3D shape (bitmap to heightfield in Rhino, other programs are also suitable)

Geotiff converted to smaller ( usable) bitmap for generating heightfield. Only top 2/3th of the picture was used to avoid the obviously erroneous jump in grey values. Black values (no data) were equalized with surrounding area to avoid deep holes in the landscape. The dark slightly curved line in the middle is the train track between Enschede and Gronau. Near the top (North) the A1 is very well visible (highway near Oldenzaal, towards de Lutte in the northeast, top right) More to the South you see the track of the A35 to Gronau
AHN elevation map (raw data, trees as well as buildings are also mapped).